<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>这是我的CSS练习</title>
		<link rel="stylesheet" type="text/css" href="外部01.css"/>
		<style type="text/css">
			.two{
				background: green;
			}
		</style>
	</head>
	<body>
		<div style="background: red;">这是内联样式表</div>
		<div class="two">这是内部样式表</div>
		<div class="three">这是外部样式表</div>
	</body>
</html>
